The Road Ahead for California’s Vehicle Emission Standards
June 29, 2026
An overview of CARBs proposed light- and medium duty “Drive Forward” proposal for MY 2031+ vehicles
An overview of CARBs proposed light- and medium duty “Drive Forward” proposal for MY 2031+ vehicles
A new in-use emissions study on heavy-duty vehicles shows that both conventional diesel and alternative fuel vehicles certified to the 0.02 g/bhp-h standard can meet future EPA NOx limits even in day-to-day operation.
From Brandon Bartneck – “I’ve spent the past four years chasing down the answer to the following question…
How do we make mobility better?
It’s meaningful. Probably the most impactful challenge that I’ve tried to help solve. But it’s far from straightforward.”
On August 12th, 2024, the California Air Resources Board (CARB) posted the latest proposed amendments to the Low Carbon Fuel Standard (LCFS). These confirm some of the previous amendments proposed earlier this year, while introducing new ones. Here is a recap of some of the important proposed changes.
The journey of the IC engine can be summed up in two words: continuous improvement. Decades of engine research coupled with the relatively recent advent of renewable fuels is accelerating the gains in emissions abatement. Check out this webinar to learn more.
Truck manufacturers are offering improved versions that meet California’s MY 2024 Low NOx standards. Here’s a comparison of the underlying after-treatment technologies.
California is looking to reduce NOx emissions from non-road engines by 90% and enforce particulate filters on all engines. Here is a summary of the latest workshop to get stakeholder feedback on Tier 5 standards.
The EU Commission has proposed Euro 7 / VII emission standards for light- and heavy-duty vehicles. Here is a quick tabular summary.
Around 40% of the US now follows California’s tougher-than-federal criteria pollutant standards. Here’s a summary of the latest, including followers of the Advanced Clean Cars rule.
California’s Air Resource Board (CARB) has passed what could be perhaps it’s last major regulation for reducing NOx and particulates from heavy-duty trucks and buses. The HD Low NOx “Omnibus” regulation practically touches upon every aspect of in-use emission reduction. Highlights summarized here.